" If games are a kind of software, why must games face this kind of regulation when other kinds of (actually more important) software doesn't / won't? "
I am neutral to the iniative but I can answer this question very clearly: Games are cultural products and you want to get the exact same experience (as you want to see the same film and not something else)
Using GIMP or Photoshop is a very different experience: Does it matter? Not so much. You can use an alternative and in case user will change. The Crew or Gran Turismo? You don't want to change so much.
I am neutral to the iniative but I can answer this question very clearly: Games are cultural products and you want to get the exact same experience (as you want to see the same film and not something else)
Using GIMP or Photoshop is a very different experience: Does it matter? Not so much. You can use an alternative and in case user will change. The Crew or Gran Turismo? You don't want to change so much.